Annual report pursuant to Section 13 and 15(d)

Derivative Instruments - Schedule of Derivative Instruments (Details)

v3.10.0.1
Derivative Instruments - Schedule of Derivative Instruments (Details)
 12 Months Ended
Dec. 31, 2018
MMBTU
$ / bbl
$ / MMBTU
bbl
NYMEX Henry Hub Swap - 2019  
Derivative [Line Items]  
Daily Volume (MMBtu/day) | MMBTU 1,254,000
Weighted average price of derivative swap (usd per MMBtu or Bbls) | $ / MMBTU 2.83
NYMEX Henry Hub Swap - 2020  
Derivative [Line Items]  
Daily Volume (MMBtu/day) | MMBTU 204,000
Weighted average price of derivative swap (usd per MMBtu or Bbls) | $ / MMBTU 2.77
Mont Belvieu C2 - 2019  
Derivative [Line Items]  
Daily Volume (Bbls/day) | bbl 1,000
Weighted average price of derivative swap (usd per MMBtu or Bbls) | $ / bbl 18.48
Mont Belvieu C3 Swap - 2019  
Derivative [Line Items]  
Daily Volume (Bbls/day) | bbl 4,000
Weighted average price of derivative swap (usd per MMBtu or Bbls) | $ / bbl 28.87
Mont Belvieu C5 Swap - 2019  
Derivative [Line Items]  
Daily Volume (Bbls/day) | bbl 500
Weighted average price of derivative swap (usd per MMBtu or Bbls) | $ / bbl 54.08
NYMEX Henry Hub Swap - January 2019 to March 2019 | Call option | Short  
Derivative [Line Items]  
Daily Volume (MMBtu/day) | MMBTU 50,000
Weighted average price of derivative swap (usd per MMBtu or Bbls) | $ / MMBTU 3.13
NYMEX Henry Hub Swap - April 2019 to December 2019 | Call option | Short  
Derivative [Line Items]  
Daily Volume (MMBtu/day) | MMBTU 30,000
Weighted average price of derivative swap (usd per MMBtu or Bbls) | $ / MMBTU 3.10
Transco Zone 4 - 2019 | Call option | Short  
Derivative [Line Items]  
Daily Volume (MMBtu/day) | MMBTU 60,000
Weighted average price of derivative swap (usd per MMBtu or Bbls) | $ / MMBTU 0.05
Transco Zone 4 - 2020 | Call option | Short  
Derivative [Line Items]  
Daily Volume (MMBtu/day) | MMBTU 60,000
Weighted average price of derivative swap (usd per MMBtu or Bbls) | $ / MMBTU 0.05